P0532 means A/C Refrigerant Pressure Sensor A Circuit Low. The A/C pressure sensor is reading lower voltage than expected, which can look like very low refrigerant pressure. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0532 means
Most engine sensors receive a 5-volt reference and return a signal between roughly 0 and 5 volts. Codes ending in circuit high or circuit low usually point to an electrical fault: an open circuit, a short or an unplugged connector. Range/performance codes mean a signal is present but disagrees with what the computer expects from the other sensors, which more often points to a dirty sensor, an air leak or a mechanical problem.
P0532 symptoms
- A/C not cooling because the compressor will not engage
- Cooling fan behavior changes
- Check engine light
Common causes of P0532
- Low refrigerant charge
- Failed pressure sensor
- Wiring shorted to ground
- Lost reference voltage
How to diagnose P0532
- Check refrigerant pressure with gauges
- Compare the sensor reading with gauge pressure
- Check sensor wiring and reference voltage
Can you drive with P0532?
Yes; the A/C may not work.
P0532 tips
A very low refrigerant charge can set this code even with a good sensor; check pressures with gauges first.
Will P0532 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0532 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0533 | A/C Refrigerant Pressure Sensor A Circuit High |
| P0480 | Cooling Fan 1 Control Circuit |
| P0651 | Sensor Reference Voltage B Circuit/Open |
Guides that help
When it is more than a sensor
Sensor codes are usually fixed with a sensor, a connector, wiring or a leak repair rather than major parts. If testing turns up internal engine trouble instead, see how to tell if an engine is blown and compare engines by code on our engines page.
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